[build] Add new build argument v8_symbol_level

May override the global symbol_level config. Useful for debugging V8
within a release Chromium, like v8_enable_debugging_features.

Change-Id: Ie081b5110dc93914cbe53fdde3cdec77822b9819
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2051959
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66262}

AUTHORS

@@ -151,6 +151,7 @@ Oliver Dunk <oliver@oliverdunk.com>
 Paolo Giarrusso <p.giarrusso@gmail.com>
 Patrick Gansterer <paroga@paroga.com>
 Peng Fei <pfgenyun@gmail.com>
+Peng-Yu Chen <pengyu@libstarrify.so>
 Peter Rybin <peter.rybin@gmail.com>
 Peter Varga <pvarga@inf.u-szeged.hu>
 Peter Wong <peter.wm.wong@gmail.com>

gni/v8.gni

@@ -57,6 +57,9 @@ declare_args() {
   # Use Perfetto (https://perfetto.dev) as the default TracingController. Not
   # currently implemented.
   v8_use_perfetto = false
+
+  # Override global symbol level setting for v8
+  v8_symbol_level = symbol_level
 }
 
 if (v8_use_external_startup_data == "") {
@@ -116,6 +119,19 @@ if (v8_code_coverage && !is_clang) {
   ]
 }
 
+if (v8_symbol_level != symbol_level) {
+  v8_remove_configs += [ "//build/config/compiler:default_symbols" ]
+  if (v8_symbol_level == 0) {
+    v8_add_configs += [ "//build/config/compiler:no_symbols" ]
+  } else if (v8_symbol_level == 1) {
+    v8_add_configs += [ "//build/config/compiler:minimal_symbols" ]
+  } else if (v8_symbol_level == 2) {
+    v8_add_configs += [ "//build/config/compiler:symbols" ]
+  } else {
+    assert(false)
+  }
+}
+
 if ((is_posix || is_fuchsia) &&
     (v8_enable_backtrace || v8_monolithic || v8_expose_symbols)) {
   v8_remove_configs += [ "//build/config/gcc:symbol_visibility_hidden" ]